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Plant_uml example to handle nested/orthogonal machines #336

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Plant_uml example to handle nested/orthogonal machines #336

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66 changes: 56 additions & 10 deletions example/plant_uml.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,15 @@
#include <iostream>
#include <string>
#include <typeinfo>
#include <set>

namespace sml = boost::sml;

struct e1 {};
struct e2 {};
struct e3 {};
struct e4 {};
struct e5 {};

struct guard {
bool operator()() const { return true; }
Expand All @@ -26,30 +28,71 @@ struct action {
void operator()() {}
} action;


struct sub {
auto operator()() const noexcept {
using namespace sml;
// clang-format off
return make_transition_table(
*"idle"_s + event<e3> /action = "s1"_s
, "s1"_s + event<e4> / action = X
);
// clang-format on
}
};

struct plant_uml {
auto operator()() const noexcept {
using namespace sml;
// clang-format off
return make_transition_table(
*"idle"_s + event<e1> = "s1"_s
, "s1"_s + event<e2> [ guard ] / action = "s2"_s
, "s2"_s + event<e3> [ guard ] = "s1"_s
, "s2"_s + event<e4> / action = X
*"idle"_s + event<e1> = state<sub>
, "idle"_s + event<e5> = state<sub>
, state<sub> + event<e2> [ guard ] / action = "s2"_s
, "s2"_s + event<e3> [ guard ] = "s1"_s
, "s2"_s + event<e4> / action = X

,*"idle2"_s + event<e2> = "s17"_s
, "s17"_s + event<e3> = X
);
// clang-format on
}
};


template <typename>
struct is_sub_state_machine : std::false_type
{};

template <class T, class... Ts>
struct is_sub_state_machine<boost::sml::back::sm<boost::sml::back::sm_policy<T, Ts...>>>
: std::true_type
{};

using strset_t = std::set<std::string>;

template <class T>
void dump_transition() noexcept {
void dump_transition(strset_t& substates_handled, int& starts) noexcept {
auto src_state = std::string{sml::aux::string<typename T::src_state>{}.c_str()};
auto dst_state = std::string{sml::aux::string<typename T::dst_state>{}.c_str()};
if (dst_state == "X") {
if (dst_state == "terminate") {
dst_state = "[*]";
}

if (T::initial) {
std::cout << "[*] --> " << src_state << std::endl;
std::cout << (starts++ ? "--\n" : "") <<"[*] --> " << src_state << std::endl;
}

if constexpr (is_sub_state_machine<typename T::dst_state>::value) {

auto [loc, suc] = substates_handled.insert(dst_state);

if (suc) {
std::cout << "\nstate " << dst_state << " {\n";
int new_starts{0};
dump_transitions(substates_handled, new_starts, typename T::dst_state::transitions{});
std::cout << "}\n";
}
}

std::cout << src_state << " --> " << dst_state;
Expand Down Expand Up @@ -78,15 +121,18 @@ void dump_transition() noexcept {
}

template <template <class...> class T, class... Ts>
void dump_transitions(const T<Ts...>&) noexcept {
int _[]{0, (dump_transition<Ts>(), 0)...};
void dump_transitions(strset_t& substates_handled, int& starts, const T<Ts...>&) noexcept {
int _[]{0, (dump_transition<Ts>(substates_handled, starts), 0)...};
(void)_;
}

template <class SM>
void dump(const SM&) noexcept {
std::set<std::string> substates_handled; // guarantee only one dump per sub-machine
int starts{0}; // '--' is required between ortho states

std::cout << "@startuml" << std::endl << std::endl;
dump_transitions(typename SM::transitions{});
dump_transitions(substates_handled, starts, typename SM::transitions{});
std::cout << std::endl << "@enduml" << std::endl;
}

Expand Down